Spring's @Scheduled error : Only one AsyncAnnotationBeanPostProcessor may exist within the context

问题:

I am trying Spring 3's @Scheduled annotation . Here is my configuration (app.xml) :

   // other beans    

And this is my service class :

@Service public class ServiceImpl implements Service , Serializable {   //other injections    @Override   @Transactional   public void timeConsumingJob()   {     try     {       Thread.sleep(10*1000);     }     catch (InterruptedException e)     {       e.printStackTrace();     }   }    @Override   @Scheduled(cron="* * * * * ?")    public void secondly()   {     System.err.println("secondly : it is " + new Date());   } } 

It works fine when testing in my eclispe + junit , when testing a timeConsumingJob method , I can see secondly() continues outputting message secondly.

But when deployed to a container (Resin/4.0.13) , it throws :

[11-03-26 12:10:14.834] {main} org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Only one AsyncAnnotationBeanPostProcessor may exist within the context. Offending resource: class path resource [app.xml]  at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)  at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)  at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:72)  at org.springframework.scheduling.config.AnnotationDrivenBeanDefinitionParser.parse(AnnotationDrivenBeanDefinitionParser.java:82) 

I searched but seldom find similar situations , I think it is the most basic setting , but don't know why it doesn't work .

Can somebody take a look at it ? Thanks a lot !

(Spring 3.0.5 , Resin 4.0.13)

------------ updated ---------

After I dig deeper , I found the app.xml is imported by another xml. Maybe this is the reason makes task:annotation-driven not working.

Well , after re-arranging some beans' location , it is solved, but I still feel puzzled. (Because it worked fine , and other.xml needs beans in app.xml )

回答1:

The application context is being initialized twice but org.springframework.scheduling.config.AnnotationDrivenBeanDefinitionParser fails registering bean ASYNC_ANNOTATION_PROCESSOR_BEAN_NAME second time.

I encountered this problem in unit tests where @ContextConfiguration("/path/to/applicationContext.xml") was accidentally on both the parent test class and child test class (with default value of inheritLocations true).

回答2:

I had this problem when I copied applicationContext.xml and created new one called applicationContextAdditional.xml. I didn't try to find the reason, but both contained namespace

      ...  

when I removed the namespace from the second one my problem was solved. Maybe it helps someone.

回答3:

I have faced this once after implementing our own AsyncTaskExecutor and forgetting to remove default

Check if you have something like this, if yes remove one of the task.

回答4:

This happens when spring parses the text twice in a config XML.

For me this was happening because both applicationContext-root.xml and applicationContext-where-annotation-driven-is-specififed.xml were imported in my WEB.xml in section.

Leaving only applicationContext-root.xml in WEB.xml solved the issue.

回答5:

In my case, this was caused by switching versions, thereby in the output file location there are multiple version of jars (and therefore each jar contains a AnnotationBean):

2018-02-19 13:38:44,913 [RMI TCP Connection(3)-127.0.0.1] ERROR org.springframework.web.context.ContextLoader - Context initialization failed org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Only one ScheduledAnnotationBeanPostProcessor may exist within the context. Offending resource: URL [jar:file:/C:/.../lib/xxx-2.0.jar!/META-INF/spring/xxx.xml] 

while I'm using 1.0 in this case. So I have to manually delete C:/.../lib/xxx-2.0.jar in this location, and I'm able to see xxx-1.0.jar is also in this directory. After the manual deletion, it works normally.

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